Owner

Current status

Detailed Description

GCC 4.8.0 has been released on March, 22nd and is currently in regression bugfix only mode. I've performed a test mass rebuild
on x86_64 with gcc-4.8.0-0.1.fc19, out of 12712 packages 11687 built successfully, 933 packages failed to build both with gcc-4.8.0-0.1.fc19 and gcc-4.7.2-9.fc19 (thus unlikely gcc related),
67 packages failed due to issues on the side of the packages, 22 failed due to bugs on the gcc side that should be fixed already in gcc-4.8.0-0.3.fc19 and 3 failed due to issues still to be fixed on the GCC side.
See https://lists.fedoraproject.org/pipermail/devel/2013-January/175876.html for details.
After gcc-4.8.0-* has been built into Fedora, a mass rebuild has been performed.
GCC 4.8.1 is going to be released in a week or so.

Benefit to Fedora

Scope

How To Test

GCC has its own testsuite, which is run during the package build, plus many other packages with automated tests also help to test the new gcc.

User Experience

Users will be able to see compiled code improvements and use the newly added features, such as improved C++11 and C11 support, improved vectorization support, etc.

Dependencies

All packages need to be rebuilt.

Contingency Plan

If bugs are discovered, I'd appreciate help from the package owners in preparing self-contained testcases to speed up analysis and fixing the bugs. Don't have time to debug issues in
12000+ packages, especially when in many cases it could be caused by undefined code in the packages etc. I don't expect we'll have to fall back to the older gcc, we've never had to do it in the past,
but worst case we can mass rebuild everything with older gcc again.